================================================================== BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x92/0x190 lib/list_debug.c:62 Read of size 8 at addr ffff8880349c9a90 by task kworker/0:6/5837 CPU: 0 UID: 0 PID: 5837 Comm: kworker/0:6 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026 Workqueue: events gfs2_withdraw_func Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 __list_del_entry_valid_or_report+0x92/0x190 lib/list_debug.c:62 __list_del_entry_valid include/linux/list.h:140 [inline] __list_del_entry include/linux/list.h:261 [inline] list_del_init include/linux/list.h:333 [inline] gfs2_remove_from_ail fs/gfs2/log.c:79 [inline] gfs2_ail_empty_tr fs/gfs2/log.c:287 [inline] gfs2_ail_drain+0x848/0xb20 fs/gfs2/log.c:954 do_withdraw+0x10d/0x2f0 fs/gfs2/util.c:126 gfs2_withdraw_func+0x2ef/0x440 fs/gfs2/util.c:-1 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 28026: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] kmem_cache_alloc_noprof+0x2b9/0x600 mm/slub.c:5010 gfs2_glock_get+0x276/0xf20 fs/gfs2/glock.c:1074 gfs2_inode_lookup+0x2a3/0xc30 fs/gfs2/inode.c:149 gfs2_lookup_root fs/gfs2/ops_fstype.c:428 [inline] init_sb+0xa55/0x1300 fs/gfs2/ops_fstype.c:497 gfs2_fill_super+0x1634/0x20d0 fs/gfs2/ops_fstype.c:1219 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1873 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1333 vfs_get_tree+0x92/0x2a0 fs/super.c:1933 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3848 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4374 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 1007: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6508 [inline] kmem_cache_free+0x182/0x650 mm/slub.c:6635 rcu_do_batch kernel/rcu/tree.c:2650 [inline] rcu_core+0x926/0x1260 kernel/rcu/tree.c:2919 handle_softirqs+0x226/0x860 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3181 [inline] call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3301 gfs2_glock_free+0x3c/0xa0 fs/gfs2/glock.c:150 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Second to last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 insert_work+0x3d/0x330 kernel/workqueue.c:2272 __queue_work+0xd07/0x10d0 kernel/workqueue.c:2448 queue_delayed_work_on+0x11a/0x1e0 kernel/workqueue.c:2669 queue_delayed_work include/linux/workqueue.h:715 [inline] gfs2_glock_queue_work fs/gfs2/glock.c:198 [inline] do_xmote+0x539/0x770 fs/gfs2/glock.c:718 glock_work_func+0x30d/0x610 fs/gfs2/glock.c:987 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff8880349c9978 which belongs to the cache gfs2_glock(aspace) of size 1176 The buggy address is located 280 bytes inside of freed 1176-byte region [ffff8880349c9978, ffff8880349c9e10) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880349cadd8 pfn:0x349c8 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88814043a500 ffff88801eb3b948 ffffea0001de6710 raw: ffff8880349cadd8 00000002000c0003 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88814043a500 ffff88801eb3b948 ffffea0001de6710 head: ffff8880349cadd8 00000002000c0003 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 7425, tgid 7424 (syz.1.639), ts 165408205202 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab+0x7d/0x620 mm/slub.c:3462 new_slab mm/slub.c:3513 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7417 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] kmem_cache_alloc_noprof+0x399/0x600 mm/slub.c:5010 gfs2_glock_get+0x276/0xf20 fs/gfs2/glock.c:1074 gfs2_inode_lookup+0x2a3/0xc30 fs/gfs2/inode.c:149 gfs2_lookup_root fs/gfs2/ops_fstype.c:428 [inline] init_sb+0xa55/0x1300 fs/gfs2/ops_fstype.c:497 gfs2_fill_super+0x1634/0x20d0 fs/gfs2/ops_fstype.c:1219 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1873 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1333 vfs_get_tree+0x92/0x2a0 fs/super.c:1933 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3848 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4374 page last free pid 5612 tgid 5612 ts 159868810153 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962 __slab_free+0x274/0x2c0 mm/slub.c:5823 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] kmem_cache_alloc_lru_noprof+0x2a3/0x5f0 mm/slub.c:5029 __d_alloc+0x37/0x6f0 fs/dcache.c:1907 d_alloc_pseudo+0x21/0xc0 fs/dcache.c:2038 alloc_path_pseudo+0x107/0x220 fs/file_table.c:407 alloc_file_pseudo+0xa8/0x1e0 fs/file_table.c:423 sock_alloc_file+0xb8/0x2e0 net/socket.c:557 sock_map_fd net/socket.c:587 [inline] __sys_socket+0x13f/0x1b0 net/socket.c:1827 __do_sys_socket net/socket.c:1832 [inline] __se_sys_socket net/socket.c:1830 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1830 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880349c9980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880349c9a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880349c9a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880349c9b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880349c9b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================